Method of rebasing artificial dentures



Patented Nov. 15 1932 UNITED STATS PATENTaoF FIcE rnmmmox n. BOWERS, or snnrnenorsoo, AI TDALFRED TRLOCKWOOD, or mama CALIFORNIA V murnon or un-BAsrne ARTIFICIAL DENTURES' N Drawing.

Artificial dentures, commonly known as false teeth, are a constant source of annoyance if they do not properly fit the wearers mouth. An improper lit may be due to sev- 8 eral causes but is mainly due to the shrinking of the gum tissues. The only remedy where a poor fit occurs in rebasing of the plate or re-making of the same. 'Rebasing as now conducted requires time and expense and is lim- 10 ited to certain types of plates only, to-wit;

vulcanite plates as rebasing is accomplished by the application of additional rubber and vulcanization thereof.

The object of the present inventionis to provide a method whereby artificial dentures whether they can be constructed of metal, vulcanite, or otherwise, may be quickly and readily rebased with a material other than vulcanized rubber. Further, to provide a method which insures an accurate fit and which can be accomplished in a short period of time.

The method of rebasing is accomplished as follows: The artificial denture is removed from the mouth of the patient and thoroughly cleaned. A comparatively thin coating of plastic material hereinafter described is then applied to the palatal surface of the plate and the plastic material is covered with a thin sheet of rubber or other suitable material. The plate thus prepared is immediately inserted in the patients mouth and an impression taken, after which the plate is again removed to determine if complete contact has been made over the entire surface of the plate. If low spots or uncontacted surfaces are found additional plastic material is employed and a second impression is taken, it being understood that any excess material applied is squeezed out over the sides or rear edges of the plate while each impression is made as considerable pressure is applied during each impression with the patient bearing tightly against the plate.

Usually one or two applications of plastic material or compound followed by the taking of the impression is sufiicient to insure a perfect contact and when this has been obtained the rubber sheet is removed and the final impression is made directly against the palatal Application filed October 15, 1. 29. Serial noQsesfisea;

surface of. the'mouth to insure as perfect a contact and lit as possible, after which the plate is taken out of the patientslmouth and trimmed to remove the excess material squeezed out over the edges during each im-= pression. The plate is thenplaced in a curing tank containing a liquid which promotes quick setting of theimaterial or compound and whichalso causes deodorization thereof; The plate thus treated is ready, and may aca cordingly be inserted by the patient and used.

a A variety of plastic compounds may be used but we prefer the following; to pure celluloid is added a solvent preferably acetone, the. amount added being just enough to form a heavy liquid or compound. A sufiicient quantity of the compound is applied to the plate to for-ma comparatively thin coat and as the compound. sets rapidly the several impres-' sions taken should be made in quick succession. The compound adheres securelywto metal plates, vulcanit e plates et cetera and can onlybe removed with great diflicultyv This is a great advantage as it permits plates of var ing material to be rebased and, fur- I theremore', permits the rebasing operation to he accomplished within a short periodof time. p I

It has been .found that the compound causes a burning sensation to gum. tissues ofv the mouth. This is probably due to the pres ence of acetone, hence the reason for-using the rubber sheet. This sheet is coated with petroleum jelly and when placed over the compound becomes interposed between the compound and the gum tissues when an ims pression is made and thus protects the tissues against the sensation of burning. The rubber sheet, however, may be removed when the last or final impression is takenas so much of the acetone has evaporated by that time to permit the final impression to be made without burning sensation to the tissue. While the use of rubber as a protective material has been found very satisfactory for this purpose, it will be understood that any suitablematerial may beemployed for this purpose without departing from the spirit of thein vention. i The samemethod applies to a lower denture using the ridge on lower jaw instead of ridge and palatal surface of upper jaw.

While certain features of. the present invention have been more or less specifically described, we wish it understood that varying changes in methods of operation may be resorted to within the scope'of the appended claims. Similarly, that the materials or compounds employed may be such asexperience' or varying conditions: may demand.

Having thus described our invention, what we claim and desire to secure by Letters Patent is- 1. A method of rebasing artificial dentures which consists in applying several coats of quick hardening plastic compound to the palatal'surface of the-denture, covering the compound with a. thin sheet of protective material, and taking an impression after the application of each coat, and taking a final directimpression against the palate of the mouth. 1

i 2. A method of'rebasing artificial dentures which consists in applying a coating of celluloid dissolvedinacetone, to the palatal surface ofthe denture covering the same. with a sheet of protective material, taking animpression. of, the, palate through said protective material and permitting the celluloid to harden;

3.... A method of rebasingartificial dentures which consists, in applying a coating of plass tic material to the palatal surface of the denture, covering the same with a sheet of rubber treated with petroleum jelly for the protection (if-the palate, taking an impression of theipalate in the-plastic material, and sub:

mersing the denture in a fluid for, hardening and deodorizing the plastic material.

i. A method of rebasing: artificial dentures which consists in applying a coating of plastic, material to the palatal surface ofthe den-- ture, covering the same with a sheet of pliable material treated with a substance for protecting the, palate, taking an impression ofthe palate in the plastic material and treating the. denture to harden and deodorize the plastic material.

FREDERICK. U. BOWERS. ALF-RED T. LOGKWOOD..

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